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Subject: Re: New Sprinkler Pump Pressure Problem


Author:
r. staudt
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Date Posted: 19:12:27 04/26/08 Sat
Author Host/IP: ool-18bd33da.dyn.optonline.net/24.189.51.218
In reply to: Jerry 's message, "New Sprinkler Pump Pressure Problem" on 08:19:18 04/13/08 Sun
 To develope a well with a compressor is very effective and very easy. We use a gas powered compressor capable of at least 25-30 cfm@90 psi. Put a galvanized or black iron air line inside the well to the top of the screen. Connect the other end of the air line to the compressor via a air hose.It helps if you can install a valve on the air line to intermitantly turn the air supply on and off.This creates a surging action which washes water back and forth through the screen which helps prevents the fines from bridging. Every so often move the air line further down the screen to develope the entire lenght of the screen>I recently installed two wells in Central Florida
>using the Brady method. Both are 1 1/4" wells about
>24' deep with the water level at about 17'. I rented a
>5 hp gas pump from Lowes to develop and test them
>with. They produced very well.
>
>#1 produced 26 gpm at startup and went down to 19 GPM
>after 1 hour of continous pumping.
>#2 produced 18 GPM at startup and went down to 12 GPM
>after 1 hour of continous pumping.
>Then I purchased my pump a 1 1/2HP Flotec Plastic
>sprinkler pump. I then Teed the two wells together
>into an 1/1/2" brady check valve (It appeared to be
>the best check valve).
>
>I then tested it again right at the pump, with the
>combined wells and the new pump and I was able to get
>20GPM. So that seemed plenty.
>
>I then fed this into my existing sprinler system. My
>largest zones are 6 x 3gpm heads or 18 GPM. It
>appeared that the 1 1/2 HP Flotec should be plenty.
>
>However here is the problem:
>
>#1 Should it take 4 to 5 minutes to produce water
>after the pump has been primed?
>
>#2 When running on the large zones the sprinkler
>pressure surges. It goes from full power down to just
>a small spray. It will cycle like this over and over
>about every 30 seconds. It does not do this on the
>small zones. If I try to start it up an hour later it
>will take it another 4 to 5 minutes to start producing
>water. Then the surging starts again.
>
>Is this a suction leak?
>
>If so how do I find it?
>
>If it is a suction leak, do you think it is before the
>check valve or after it? Since it is taking 4 to 5
>minutes to start producing water.
>
>My pressure guage is only showing about 29 to 30 lbs,
>shouldn't this be higher?
>
>Do I need a bigger pump?
>
>Thanks for your help.
>
>Jerry
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Subject Author Date
Re: New Sprinkler Pump Pressure ProblemJerry06:57:41 04/29/08 Tue

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